Question

Match each shape with its perimeter or circumference. Use 3.14 for (PI) and round to the nearest whole number where necessary.

A. 19 cm
B. 14 cm
C. 12 cm
D. 16 cm

Please help !

Answer 1

Heres the image

Answer 2

It's a circle of radius 3 cm, can you find its circumference?
Do you know the formula for this?

Answer 3

nope ,its a pre test before im supposed to read any lessons and try to get a good grade .

Answer 4

Okay:)
The formula for perimeter of a circle with radius R is
\[C=2\pi r\]
r=3 cm here
so
\[C=2 \times \pi \times r\]
Can you do the calculations?

Answer 5

i basicly multiply 3.14 by r which is 3 ?

Answer 6

Yeah and we have a 2 also

Answer 7

so 3.14 x 3 x 2 will give me my answer ?

Answer 8

\[ 2\times 3.14 \times 3\]

Answer 9

Yeah, you'll get the perimeter or circumference of the circle, and then see which is the option

Answer 10

when i multiplied it i got 18.84

Answer 11

and when I round , my nearest whole number is 19 ....

Answer 12

Yeah, you're right.
Always remember this formulae

Answer 13

Thank you !